ALLAH SWT dont like the people who creates "Fasad and Sher". so you should also keep this friend and foe away from the dictionary.
i suggest you ask your daughter to do the istakhara. we get ourselves into relationship in the name of ALLAH SWT, so if the situation is something like you mentioned its good to go what ALLAH SWT has chosen for us.
ps. give em a call that if their son is willing to marry your daughter then you will more than happy to bond it cuz you also dont want to drag this fight. and if you serve your daughter with good knowledge then you shouldn't fear anything, and be positive about it.
ps2. it will be better if you also elaborate on the guys background, cuz only credential you mentioned is he is rich. i will suggest you to find a guy for your daughter based on "Taqwa"
There is no way i am going to call them, they need to settle their house first, there would be big riots in there house as well. Let them settle themselves one way or other (it would be good if the idea shot down at their level, it would save me agony of bing bad guy in the eye of her).
As mentioned the guy is a distant cousin, doing his BBA from a local university in Karachi, personally i do not mix with them even before my brother's marriage, but my children has very good impression about him.